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P-T-time-isotopic evolution of coesite-bearing eclogites: Implications for exhumation processes in SW Tianshan

文献类型：期刊论文

作者Tan, Zhou1,2; Agard, Philippe2,4; Gao, Jun1,3; John, Timm5; Li, JiLei1; Jiang, Tuo6; Bayet, Lea; Wang, XinShui1; Zhang, Xi7
刊名LITHOS
出版日期2017-05-01
卷号278页码:1-25
关键词UHP metamorphism Oceanic edogite Zircon U-Pb and oxygen isotope Thermodynamic modeling Exhumation pattern Chinese Southwestern Tianshan
ISSN号0024-4937
DOI10.1016/j.lithos.2017.01.010
文献子类Article
英文摘要The Chinese Southwestern Tianshan high-to ultra-high pressure low temperature (HP-UHP/LT) metamorphic belt exhibits well-preserved mafic layers, tectonic blocks/slices and boudins of different sizes and lithology embedded within dominant meta-volcanosedimentary rocks. Despite a wealth of previous studies on UHP relicts, P-T path estimates and age constraints for metamorphism, controversies still exist on P-T-t assessments and regional exhumation patterns (i.e., tectonic m lange versus internally coherent "sub-belt" model). This study focuses on a group of coesite-bearing eclogite samples from a thick (similar to 5 m) layered metabasalt outcrop in order to unravel its detailed tectono-metamorphic evolution through space and time (both prograde, peak and exhumation). Using SIMS zircon U-Pb and oxygen isotope analyses, TIMS Sm-Nd multi-point isochron dating, in situ laser-ICP-MS trace-element analyses, classical thermobarometry and thermodynamic modeling, we link the multistage zircon growth to garnet growth and reconstruct a detailed P-T-time-isotopic evolution history for this UHP tectonic slice: from UHP peak burial similar to 2.95 +/- 02 GPa, 510 +/- 20 degrees C around 318.0 +/- 2.3 Ma to HP peak metamorphism similar to 2.45 +/- 0.2 GPa, 540 +/- 20 degrees C at 316.8 +/- 0.8 Ma, then, with eclogite-facies deformation similar to 2.0 +/- 0.15 GPa, 525 +/- 25 degrees C at 312 +/- 2.5 Ma, exhumed to near surface within ca. 303 to ca. 280 Ma. Our P-T-time-isotopic results combined with the compilation of regional radiometric data" and P-T estimates notably point to the existence of a short-lived period of rock detachment and exhumation (<10 Ma, i.e. at ca. 315 +/- 5 Ma) with respect to subduction duration. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词FLUID-ROCK INTERACTION ; PRESSURE/LOW-TEMPERATURE ROCKS ; CHINESE SOUTHWESTERN TIANSHAN ; CALCULATED MINERAL EQUILIBRIA ; TRACE-ELEMENT MOBILIZATION ; HP-LT ROCKS ; WESTERN TIANSHAN ; NW-CHINA ; SOUTH TIANSHAN ; METAMORPHIC EVOLUTION
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000399258500001
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41390440 ; "Zooming in between plates" (Marie Curie International Training Network) ; 41390445 ; 41025008) ; National Natural Science Foundation of China(41390440 ; "Zooming in between plates" (Marie Curie International Training Network) ; 41390445 ; 41025008) ; National Natural Science Foundation of China(41390440 ; "Zooming in between plates" (Marie Curie International Training Network) ; 41390445 ; 41025008) ; National Natural Science Foundation of China(41390440 ; "Zooming in between plates" (Marie Curie International Training Network) ; 41390445 ; 41025008)
源URL[http://ir.iggcas.ac.cn/handle/132A11/41600]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Gao, Jun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.UPMC Univ Paris 06, Sorbonne Univ, CNRS, Inst Sci Terre Paris ISTeP, 4 Pl Jussieu, F-75005 Paris, France
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Insitut Univ France, F-75005 Paris, France
5.Free Univ Berlin, Inst Geolog Wissensch, Malteserstr 74-100, D-12449 Berlin, Germany
6.Wuhan Ctr China Geol Survey, Lab Isotope Geochem, Wuhan 430205, Peoples R China
7.China Minmet Corp, Beijing 100010, Peoples R China
推荐引用方式
GB/T 7714		 Tan, Zhou,Agard, Philippe,Gao, Jun,et al. P-T-time-isotopic evolution of coesite-bearing eclogites: Implications for exhumation processes in SW Tianshan[J]. LITHOS,2017,278:1-25.
APA Tan, Zhou.,Agard, Philippe.,Gao, Jun.,John, Timm.,Li, JiLei.,...&Zhang, Xi.(2017).P-T-time-isotopic evolution of coesite-bearing eclogites: Implications for exhumation processes in SW Tianshan.LITHOS,278,1-25.
MLA Tan, Zhou,et al."P-T-time-isotopic evolution of coesite-bearing eclogites: Implications for exhumation processes in SW Tianshan".LITHOS 278(2017):1-25.

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来源：地质与地球物理研究所

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